Electrochemical characterization of hexamethylguanidinium bis(fluorosulfonyl)imide [HMG][FSI] based electrolyte and its application in sodium metal batteries oleh Karolina Biernacka, Ju Sun, Faezeh Makhlooghiazad, Ali Balkis, Isuru E Gunathilaka, Luke A O’Dell, Montserrat Galceran Mestres, Patrick C Howlett, Jennifer M Pringle, Maria Forsyth